I searched for this luna88k and was taken to a Wikipedia page that I read until I realized it was for a computer called LUNA but it had a 68k processor.
The reason it came up was a tiny quote from the NetBSD announcement of Luna 68k support which mentions its "rare cousin" the 88k LUNA.
Also a good example of what I understand the OpenBSD development goals to be: developers work on the features and hardware support that interest them. It isn't a popularity contest; targeting the most popular platforms or growing the number of users of OpenBSD is not a project goal.
So as long as there are developers who want to do the work to support the 88k LUNA (whatever it is) then it will happen.
I thought I knew a lot about 68k processors, but "88k" is new to me. It turns out to be the Motorola 88100¹, which was used in Unisys servers running Unix.
Motorola had a lot of VME bus boards with 88100/88110 CPUs. There's still a web site dedicated to the 88k CPUs at http://www.m88k.com
Fun fact - the 88k was designed by Mitch Alsup, who also designed SPARC CPUs for Ross, x86s for AMD and others. He is retired, but still active in the comp.arch Usenet newsgroup.
The reason it came up was a tiny quote from the NetBSD announcement of Luna 68k support which mentions its "rare cousin" the 88k LUNA.
Now that's niche!